Let me start by quoting Cam from Modern Family, who astutely observed the following: “Excuse me, Meryl Streep could play Batman and be the right choice.” And I agree.
I watched this during a movie night with my mom. She was working on her art, and I was knitting, and we made the mistake of watching it after Terms of Endearment, which is perfection and nothing else can be said about it.

image from amazon.com
Netflix then suggested we watch August: Osage County directed by John Wells. This film has good acting all over the place. Each member of the stunning ensemble cast absolutely shines–as you would expect. Except there are so many other problems with the film that I started to marvel that the actors could pull off these impossible scenes.
So, first: melodrama. This film is melodrama. Midway through the film, Meryl Streep is running wildly through a hay field, chased by her reticent daughter (Julia Roberts), and the audience is just sort of embarrassed, and tired, and no longer buying in (even though we wanted to! even though we love Meryl Streep and Julia Roberts!). The scene where they’re running through the field and the very long, après funeral dinner scene are so over the top that there’s no recovering. The melodrama might go over better on stage.
That said, the film does deal with compelling emotional content and succeeds at pairing emotional content to characters, but struggles with putting those emotions to plot and story. The film deals with powerful stuff: struggles with addiction, unhealthy boundaries, and loving and withholding. With more subtlety, this film could have been spectacular.